19
Information regarding the safety
valve
The system must be equipped with a
type-tested diaphragm safety valve as
protection against overpressure.
Permiss. operating pressure: 10 bar.
The connection diameter of the safety
valve must be R ¾ (DN 20).
Consequently, the max. permissible
heat input would be 150 kW. If the heat
input of the Vitocell exceeds 150 kW,
select a larger safety valve that is able to
cope with the respective heat input (see
DIN 4753-1, issue 3/88, section 6.3.1).
Install the safety valve in the cold water
pipe. It must not be able to be isolated
from the DHW cylinder.
The pipework between the safety valve
and the DHW cylinder must not be
restricted in any way.
The safety valve discharge pipe must not
be able to be closed. Expelled water
should be safely and visibly drained into
a sewer. Place a sign close to the safety
valve discharge pipe or on the safety
valve itself with the following inscription:
"For safety reasons, water may be dis-
charged from the discharge pipe during
heating. Never seal off!"
Install the safety valve above the top
edge of the DHW cylinder.
Connecting the heating water side
■ Adjust the thermostat and high limit
safety cut-out so that the DHW tem-
perature in the cylinder never exceeds
95 ºC.
■ Connect all pipework with detachable
fittings.
Permissible temperatures
on the solar side:
140 °C
on the heating water side:
110 °C
Permissible operating pressure
on the solar side:
10 bar
on the heating water side:
3 bar
Test pressure
on the solar side:
16 bar
on the heating water side:
4.8 bar
1.
Install the flow pipes with an incline
and fit an air vent valve at the highest
point.
2.
Install control equipment that
ensures the permissible tempera-
tures on the heating side are main-
tained.
3.
Install an additional type-tested high
limit safety cut-out, if none has been
installed so far in the system. For this,
use a twin thermostat (temperature
limiter and high limit safety cut-out).
4.
Seal all unused connections with
plugs or caps.
Installation sequence
Connecting the DHW side
(cont.)
5719 714 UAE
Installation
Summary of Contents for Vitocell 340-M
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